EP2807754B1 - Koordinierter uplink-mehrpunkt - Google Patents

Koordinierter uplink-mehrpunkt Download PDF

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Publication number
EP2807754B1
EP2807754B1 EP13741615.2A EP13741615A EP2807754B1 EP 2807754 B1 EP2807754 B1 EP 2807754B1 EP 13741615 A EP13741615 A EP 13741615A EP 2807754 B1 EP2807754 B1 EP 2807754B1
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European Patent Office
Prior art keywords
parameter
circuitry
virtual cell
cyclic shift
comp
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English (en)
French (fr)
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EP2807754A1 (de
EP2807754A4 (de
Inventor
Debdeep CHATTERJEE
Kamran Etemad
Rongzhen Yang
Jong-Kae Fwu
Apostolos Papathanassiou
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Apple Inc
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Apple Inc
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Definitions

  • Embodiments of the present invention relate generally to the field of communications, and more particularly, to uplink coordinated multi-point operation in wireless communication networks.
  • CoMP Coordinated multi-point
  • LG ELECTRONICS "Discussions on DMRS configuration for CoMP", 3GPP DRAFT; R1-113Q84ARD GENERATION PARTNERSHIP PROJECT (AGPP), MOBILE COMPETENCE CENTRE ; 6so, ROUTE DES LUCIOLES ; F-06021 SOPHIA- ANTIPOLIS CEDEX ; FRANCE, vol.
  • RAN WG1 no, San Francisco, USA; 2011111420111118, 8 November 2011 discloses that the coscheduling capability of the Rel-10 specification may limit the achievable CoMP gain because of unavoidable interference among DMRS from different TPs.
  • the network can assign different sequences to different points such that more pseudo-orthogonal DMRS patterns can be provided within a cell.
  • the configurability of DMRS sequence should be introduced.
  • Embodiments of the present disclosure may relate to uplink (UL) coordinated multi-point (CoMP) in wireless communication networks.
  • embodiments of the present disclosure may relate to defining aspects of a control and signaling framework for operation of UL CoMP.
  • the phrase "in one embodiment” is used repeatedly. The phrase generally does not refer to the same embodiment; however, it may.
  • the terms "comprising,” “having,” and “including” are synonymous, unless the context dictates otherwise.
  • the phrase “A/B” means “A or B”.
  • the phrase “A and/or B” means “(A), (B), or (A and B)”.
  • the phrase “at least one of A, B and C” means "(A), (B), (C), (A and B), (A and C), (B and C) or (A, B and C)".
  • the phrase “(A) B” means "(B) or (A B)", that is, A is optional.
  • module may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group) and/or memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that provide the described functionality.
  • ASIC Application Specific Integrated Circuit
  • processor shared, dedicated, or group
  • memory shared, dedicated, or group
  • FIG. 1 schematically illustrates a wireless communication network 100 in accordance with various embodiments.
  • Wireless communication network 100 may be an access network of a 3rd Generation Partnership Project (3GPP) long-term evolution (LTE) network such as evolved universal mobile telecommunication system (UMTS) terrestrial radio access network (E-UTRAN).
  • Network 100 may be configured to support uplink (UL) coordinated multipoint (CoMP) operation, for which there is presently no specification defined by the 3GPP standards body.
  • the UL CoMP operations may include determining a UL CoMP cooperating set that may be a set of points intended to receive data from a UE.
  • the UL CoMP cooperating set may be UE-specific and, if signaled to the UE, may be set or changed dynamically via radio resource control (RRC) or medium access control (MAC) signaling.
  • the network 100 may include a mobile device or terminal, e.g., user equipment (UE) 104, configured to wirelessly communicate with a number of base stations, e.g., enhanced node base stations (eNB) 108a, 108b, and 108c (collectively 108). While embodiments of the present invention are described with reference to an LTE network, some embodiments may be used with other types of wireless access networks.
  • UE 104 and eNBs 108 may be configured to determine, provide, and/or receive control signaling and message signaling parameters to support UL CoMP operations in network 100.
  • the control and message signaling parameters may include channel state information reference signals (CSI-RS) resource configuration parameters, open loop power control parameters, UL demodulation reference signals (DM-RS) parameters, sounding reference signal (SRS) parameters, and parameters related to physical uplink control channel (PUCCH) resource allocation.
  • CSI-RS channel state information reference signals
  • DM-RS UL demodulation reference signals
  • SRS sounding reference signal
  • PUCCH physical uplink control channel
  • UE 104 may include a communications module 112 coupled to one or more antennas 116.
  • Communications module 112 may include physical layer circuitry 118 coupled to one or more antennas 116, MAC layer circuitry 120, user plane circuitry 122, control plane circuitry 124, and RRC circuitry 126.
  • control plane circuitry 124 and user plane circuitry 122 may be communicatively coupled to physical layer circuitry 118 through MAC layer circuitry 120.
  • MAC layer circuitry 120 may be an interface configured to communicate user plane signals and/or control plane signals to and/or from physical layer circuitry 118.
  • RRC circuitry 126 may be integrated into control plane circuitry 124.
  • eNBs 108 may collectively be configured as a UL CoMP cooperating set, and one or more eNBs 108 may be configured as an UL CoMP reception point (RP) set with respect to UE 104, according to various embodiments.
  • a UL CoMP RP set may be a set of points that a may actively receive data from UE 104.
  • the UL CoMP RP set may be a subset of a UL CoMP cooperating set.
  • eNB 108a may include a communications module 128, and one or more antennas 130.
  • Communications module 128 may include physical layer circuitry 132, MAC layer circuitry 134, user plane circuitry 138, and control plane circuitry 138.
  • MAC layer circuitry 134 may include MAC control element (MAC-CE) circuitry 142, and control plane circuitry 140 may include RRC circuitry 144.
  • Control plane circuitry 132 and user plane circuitry 138 may be communicatively coupled to physical layer circuitry 132 through MAC layer circuitry 134.
  • MAC layer circuitry 134 may be an interface configured to communicate user plane signals and/or control plane signals to and/or from physical layer circuitry 132.
  • eNBs 108b and 108c may include similar features as eNB 108a to determine, provide, and/or receive control signaling and message signaling parameters to support UL CoMP operations in network 100.
  • CSI-RS resource configuration may include information on transmit power, periodicity, subframe offset, initialization seeds, and number of antenna ports available on UE 104 and/or eNBs 108.
  • CSI-RS may include information to enable UE 104 to identify and select a particular point, e.g., reception point.
  • eNB 108a may provide the CSI-RS resource configuration through the CoMP initialization process via control signaling.
  • eNB 108a may provide the CSI-RS resource configuration with RRC circuitry 144 through RRC signaling.
  • eNB 108a may be configured to assign an index to each CSI-RS resource in a CoMP Resource Management (CRM) set, when defined.
  • CRM CoMP Resource Management
  • the CRM set may be a set of CSI-RS resources for which CSI-RS based received signal measurements can be made and reported.
  • eNB 108a may alternatively be configured to assign an index to each CSI-RS resource in a set of points that measure UE 104 UL transmissions for pathloss estimations.
  • eNB 108a may assign the indices implicitly, based on the order of CSI-RSs included in a CSI-RS configuration message, or eNB 108 may assign a 3-4 bit index to each CSI-RS resource.
  • CSI-RS resource indices may be assigned as part of RRC configuration or initialization.
  • eNB 108a may assign an index to each CSI-RS resource based on an order of CSI-RSs included in a CSI-RS configuration message.
  • eNB 108a may be configured to reuse CSI-RS resource configuration of downlink CoMP.
  • eNB 108a may be configured to reuse the CSI-RS resource configuration of DL CoMP to facilitate the signaling and configuration information that supports UL CoMP.
  • eNB 108a may independently incorporate the reused CSI-RS configuration during UL CoMP initiation.
  • eNB 108a may use the CSI-RS resource configuration to identify and signal additional UL parameters, as described below.
  • UE 104 and/or eNB 108a may be configured to identify each point in the UL CoMP cooperating set using the respective CSI-RS resource index of the point. Accordingly, respective CSI-RS resource indices may be used as a pointer to a particular CSI-RS resource during subsequent signaling. If eNB 108a assigns CSI-RS resource indices during RRC configuration, eNB 108 may explicitly or implicitly define the indices based on the order of CSI-RSs present in the corresponding RRC message. eNB 108 may similarly assign CSI-RS indices for DL and UL operations. However, the UL CoMP cooperating set, may be different from the DL CoMP CSI measurement set, according to various embodiments.
  • UE 104 and/or eNB 108 may be configured to select, determine, or update UL power control (PC) parameters based on a removal or addition of an RP to a CoMP RP set.
  • PC power control
  • An example of the UL PC parameter set may be defined TABLE 1, according to one embodiment.
  • UE 104 and/or eNB 108a may update or redefine the UL PC parameters, according to various embodiments of the disclosure.
  • eNB 108a may set or determine the power control parameters in a dynamic RRC message, MAC message, or physical layer (PHY) message.
  • eNB 108a may set UL PC parameter and indicate the CoMP RP set in the same RRC, MAC, or PHY message. Setting the PC parameter in the same RRC, MAC, or PHY message as indicating the CoMP RP set may provide more flexibility than other techniques used to set PC parameters.
  • Control plane circuitry 124 of UE 104 may be configured to receive the RRC, MAC, or PHY message, and determine UL PC parameters for UE 104 based on the message.
  • UL PC parameters may be cell specific and semi-static. Therefore, according to a second embodiment, eNB 108a may be configured to generate a list or set of UL PC parameter sets applicable to different combinations of RPs. eNB 108a may generate the list or set of UL PC parameter sets based on the CSI-RS resource indices of the points. RRC circuitry 126 of UE 104 may then receive the list or set of UL PC parameter sets via RRC messaging. The list or set of UL PC parameter sets may be subsequently updated by MAC signaling, e.g., between MAC layer circuitry 134 to MAC layer circuitry 120 or between MAC-CE circuitry 142 to MAC circuitry 120. Through MAC layer dynamic signaling of the CoMP RP set, control plane circuitry 124 of UE 104 may apply the updated UL PC parameters.
  • MAC signaling e.g., between MAC layer circuitry 134 to MAC layer circuitry 120 or between MAC-CE circuitry 142 to MAC circuitry 120.
  • generating lists or sets of UL PC parameter sets by eNB 108a may be more efficient than setting UL PC parameters in the same dynamic message used to indicate the CoMP RP set.
  • referencing the UL PC parameters with CSI-RS resource indices of the points in the CoMP RP set may enable UE 104 to determine pathloss information using average received power measured by UE 104 on CSI-RS. Based on the optimality-signaling overhead tradeoff, it may be sufficient to semi-statically signal the CSI-RS resource index of only the preferred RP via RRC layer, especially in low-mobility scenarios. In embodiments, low-mobility scenarios include speeds that are approximately 3 km/h and less.
  • control plane circuitry 124 of UE 104 may directly receive UL PC parameters and pathloss offset values by the signaling of the appropriate indices in the list(s) of UL PC parameters and pathloss offset values via RRC, MAC, or PHY messaging by the eNB 108a.
  • the parameters for UL DM-RS include parameters that may enable UE 104 to choose a base sequence, cyclic shift (CS), and orthogonal cover code (OCC) for a DM-RS sequence for the UE 104.
  • CS cyclic shift
  • OCC orthogonal cover code
  • control plane circuitry 140 may assign both base sequences and CSs in a UE-specific manner.
  • eNB 108a may configure a limited number of base sequences at the cell level instead of each cell being associated with only one base sequence. There may be overlap between the sets of base sequences associated with different points in the CRM set. As a result, eNB 108a may dynamically assign scheduled UEs, such as UE 104, a base sequence from the set of base sequences for this CRM set. eNB 108a may dynamically assign the scheduled UEs based on scheduling decisions made at eNB 108a.
  • eNB 108a may semi-statically, e.g., at the RRC level, configure a super set of base sequences through broadcast or dedicated signaling.
  • the cell-specific base sequences are derived using the physical cell-ID (PCI).
  • PCI physical cell-ID
  • the RRC configuration of this set of base sequences can also be based on the use of cell-IDs.
  • eNB 108a may reserve virtual cell-IDs (VCIDs) for the calculation of base sequence seeds used to derive the base sequences, group hopping patterns, and sequence hopping patterns.
  • VCIDs virtual cell-IDs
  • eNB 108a may rely on RRC configurations that directly list the value of seeds to be used to derive the base sequences, group hopping, and sequence hopping patterns.
  • no dynamic indication of DM-RS sequences would be necessary if eNB 108a configures a single VCID instead of the super set of VCIDs/base sequence seeds via semi-static RRC signaling.
  • eNB 108a may use MAC-CE circuitry 142 to signal the dynamic selection of the seed/VCID to be used by UL CoMP for a given UE.
  • eNB 108a may combine dynamic selection of the seed/virtual cell-IDs with MAC-CE messaging used for UL PC setting.
  • eNB 108a may use physical layer circuitry 132 to signal dynamic selection of the seed/virtual cell-IDs through Downlink Control Information (DCI) carried by the Physical Downlink Control Channel (PDCCH) using an explicit or implicit index, e.g. using some pre-defined order, to the seed/VCID in the configuration message.
  • DCI Downlink Control Information
  • PDCCH Physical Downlink Control Channel
  • eNB 108a and UE 104 may be configured to determine a value of CS for the UL DM-RS. eNB 108a and UE 104 may derive the CS based on three parameters: n (1) DMRS , n (2) DMRS, ⁇ , n PN (n s ).
  • n (1) DMRS is a CS parameter that is specified by a parameter named cyclicshift (specified according to Table 5.5.2.1.1-2 of 3GPP TS 36.211) which may be provided by higher layers, such as MAC and RRC, as in LTE Rel-10 (non-CoMP) operation.
  • n (2) DMRS, ⁇ is a CS parameter that may indicate the CS and OCC to be used by the UE 104 to generate the DM-RS sequence to be transmitted.
  • eNB 108a may signal n (2) DMRS, ⁇ via the most-recent uplink related DCI for the transport block associated with the corresponding physical uplink shared channel (PUSCH) transmission and which can be included in the physical downlink control channel (PDCCH), as is done in Rel-10 (non-CoMP) operation.
  • n PN (n s ) is a CS parameter that defines slot-by-slot hopping mechanism between the CSs used by UE 104, and is derived from the physical cell ID according to Rel-10 specifications.
  • n PN may depend on the same seed/VCID used for the derivation of the base sequence or may be signaled by the eNB 108a, independent of the seed/VCID used for derivation of the base sequence. Additionally, to increase the user capacity of UL DM-RS for UL CoMP, the number of CSs that can be signaled by UE 104 or/and eNB 108a may be extended from 8 to a higher number, e.g., 12, by using one extra bit in the DCI.
  • the OCC information may be configured in a UE-specific manner via the n (2) DMRS, ⁇ parameter and may be communicated to the UE dynamically through the DCI carried by the PDCCH, as in Rel-10 (non-CoMP) operation.
  • eNB 108a may be configured to signal the SRS parameters in a manner similar to that described for UE-specific UL DM-RS.
  • eNB 108a may signal SRS parameters with a combination of semi-static settings for a limited set of choices using broadcast/unicast RRC signaling followed by UE-specific dynamic setting at the RRC or MAC messaging level. Similar to the case of UE-specific DM-RS, dynamic signaling may not provide added benefit if only a single choice of SRS base sequence (based on explicit RRC signaling of the seed or VCID) is configured semi-statically via RRC.
  • the number of CSs that can be signaled may be extended from 8 to a higher number, e.g., 16, by using one extra bit in the DCI.
  • UL PC parameters for SRS transmission may be selected based on the UL CoMP cooperating set and in a similar manner as described earlier for the signaling of the UL PC parameters (for PUSCH/PUCCH transmission) with the signaling of the CSI-RS resource indices corresponding to the UL CoMP cooperating set.
  • it may be sufficient to semi-statically signal, via RRC layer circuitry 126 and 144, only the preferred CSI-RS resource index for pathloss information to be used by the UE for open loop power control (OLPC) for SRS.
  • OLPC open loop power control
  • PUCCH resource allocation parameters may include UE-specific ACK/NACK resource offset (N (1) PUCCH ) for dynamic resource indication for PUCCH format 1a/1b, wherein N (1) PUCCH indicates the starting location of dynamic ACK/NACK.
  • UE-specific ACK/NACK resource offset signaling may reduce potential collisions at the pico-cell during times when UE 104 receives downlink information from a macro-cell, e.g., eNB 108b, while transmitting uplink information to a pico-cell, e.g., eNB 108a.
  • PUCCH resource allocation parameters may include the configuration of the UL CoMP cooperation set in a UE-specific way.
  • the eNB 108a may signal VCID values to generate PUCCH base sequences in a UE-specific way via RRC layer circuitry 144 in order to achieve gains from better interference orthogonalization between PUCCH transmissions by UEs in neighboring cells within the CoMP set and/or from area splitting gains in scenarios wherein a number of low power nodes (LPNs) share the same cell identity with a macro node as in CoMP Scenario 4 (as defined in 3GPP TR 36.819).
  • the values for the VCID or base sequence seeds for PUSCH DM-RS, PUCCH, and SRS may be independent.
  • Figure 2 illustrates a flow diagram 200 of signaling UE-specific SRS parameters according to embodiments.
  • a UE may receive, through RRC signaling, a plurality of sets of SRS parameters of a cell to which the UE is connected.
  • the plurality of sets of SRS parameters may be broadcast or may be unicast by the cell.
  • a UE may receive, through RRC-level signaling or media access control (MAC)-level signaling, an indication of a set of SRS parameters, selected from the plurality of sets, to be used for SRS transmission. Receipt of the indication of the set of SRS parameters may enable the UE to operate efficiently by enabling the UE to select from a finite set of parameters in place of causing the UE to determine the SRS parameters based on other information.
  • MAC media access control
  • the eNB may be configured to signal more than eight cyclic shift values to increase capacity of SRS in UL CoMP operation.
  • the eNB may also be configured to semi-statically determine and signal a preferred one of a number of RPs that may be indicated by a certain CSI-RS index.
  • Semi-statically signaling a preferred RP may enable the UE to obtain pathloss information that may be used by the UE to determine open loop power control parameters for SRS transmissions.
  • the UE may receive CSI-RS indices from the eNB and may semi-statically determine a respective CSI-RS index of the preferred one of a number of RPs of an UL CoMP cooperating set based on an RRC message from the eNB.
  • a UE may be enabled or configured to adjust power control parameters of SRS transmissions based on a UL CoMP cooperating set.
  • the UE may adjust the power control parameters corresponding to a plurality of CSI-RS resource indices signaled by the eNB that may correspond to the UL CoMP cooperating set.
  • Figure 3 illustrates a flow diagram 300 of PUCCH resource allocation and PUCCH sequence assignment for efficient support of UL CoMP.
  • a UE may be configured to determine UE-specific ACK/NACK resource offset N (1) PUCCH for transmitting PUCCH with dynamic ACK/NACK, e.g., PUCCH formats 1a/1b as specified in 3GPP TS 36.211.
  • a UE may be configured to determine a configuration of an uplink CoMP cooperation set, a base sequence assignment based on an explicit indication of a virtual cell identification, or an explicit indication of a UE-specific base sequence assignment to support UL CoMP with better inter-point interference mitigation and/or with area splitting gains.
  • Figure 4 illustrates a flow diagram 400 of signaling UE-specific UL DM-RS parameters according to embodiments.
  • a UE may receive, through semi-static RRC signaling, a plurality of sets of UE-specific DM-RS parameters.
  • the plurality of sets of SRS parameters may be broadcast or may be unicast by the cell.
  • a UE may receive, through media access control (MAC)-level signaling or via the latest uplink-related DCI carried by the PDCCH, an indication of a set of DM-RS parameters, selected from the plurality of sets, to be used for DM-RS transmission.
  • MAC media access control
  • the dynamic signaling may not provide additional benefit if only a single set of UE-specific DM-RS parameters is semi-statically signaled at RRC layer.
  • FIG. 5 illustrates, for one embodiment, an example system 500 comprising one or more processor(s) 504, system control logic 508 coupled with at least one of the processor(s) 504, system memory 512 coupled with system control logic 508, non-volatile memory (NVM)/storage 516 coupled with system control logic 508, and a network interface 520 coupled with system control logic 508.
  • processor(s) 504 processor(s) 504
  • system control logic 508 coupled with at least one of the processor(s) 504
  • system memory 512 coupled with system control logic 508, non-volatile memory (NVM)/storage 516 coupled with system control logic 508, and a network interface 520 coupled with system control logic 508.
  • NVM non-volatile memory
  • Processor(s) 504 may include one or more single-core or multi-core processors. Processor(s) 504 may include any combination of general-purpose processors and dedicated processors (e.g., graphics processors, application processors, baseband processors, etc.). In an embodiment in which the system 500 implements UE 104, processors(s) 504 may be included in communication module 112. In an embodiment in which the system 500 implements eNB 108, processor(s) 504 may be included in communications module 128. According to various embodiments, processor(s) 504 and system memory 512 may be configured as user plane circuitry 122, control plane circuitry 124, and/or RRC circuitry 126. According to various embodiments, processor(s) 504 and system memory 512 may be configured as user plane circuitry 138, control plane circuitry 140, and/or RRC circuitry 144.
  • general-purpose processors and dedicated processors e.g., graphics processors, application processors, baseband processors, etc.
  • System control logic 508 may include any suitable interface controllers to provide for any suitable interface to at least one of the processor(s) 504 and/or to any suitable device or component in communication with system control logic 508.
  • System control logic 508 for one embodiment may include one or more memory controller(s) to provide an interface to system memory 512.
  • System memory 512 may be used to load and store data and/or instructions, for example, for system 500.
  • System memory 512 for one embodiment may include any suitable volatile memory, such as suitable dynamic random access memory (DRAM), for example.
  • DRAM dynamic random access memory
  • NVM/storage 516 may include one or more tangible, non-transitory computer-readable media used to store data and/or instructions, for example.
  • NVM/storage 516 may include any suitable non-volatile memory, such as flash memory, for example, and/or may include any suitable non-volatile storage device(s), such as one or more hard disk drive(s) (HDD(s)), one or more compact disk (CD) drive(s), and/or one or more digital versatile disk (DVD) drive(s), for example.
  • HDD hard disk drive
  • CD compact disk
  • DVD digital versatile disk
  • the NVM/storage 516 may include a storage resource physically part of a device on which the system 500 is installed or it may be accessible by, but not necessarily a part of, the device. For example, the NVM/storage 516 may be accessed over a network via the network interface 520.
  • System memory 512 and NVM/storage 516 may respectively include, in particular, temporal and persistent copies of instructions 524.
  • Instructions 524 may include instructions that when executed by at least one of the processor(s) 504 result in the system 500 implementing a one of the methods Figures 2-4 , described herein.
  • instructions 524, or hardware, firmware, and/or software components thereof, may additionally/alternatively be located in the system control logic 508, the network interface 520, and/or the processor(s) 504.
  • Network interface 520 may have a transceiver 522 to provide a radio interface for system 500 to communicate over one or more network(s) and/or with any other suitable device.
  • the transceiver 522 may be implemented at part of physical layer circuitry 118 or 132. In various embodiments, the transceiver 522 may be integrated with other components of system 500.
  • the transceiver 522 may include a processor of the processor(s) 504, memory of the system memory 512, and NVM/Storage of NVM/Storage 516.
  • Network interface 520 may include any suitable hardware and/or firmware.
  • Network interface 520 may include a plurality of antennas to provide a multiple input, multiple output radio interface.
  • Network interface 520 for one embodiment may include, for example, a network adapter, a wireless network adapter, a telephone modem, and/or a wireless modem.
  • At least one of the processor(s) 504 may be packaged together with logic for one or more controller(s) of system control logic 508.
  • at least one of the processor(s) 504 may be packaged together with logic for one or more controllers of system control logic 508 to form a System in Package (SiP).
  • SiP System in Package
  • at least one of the processor(s) 504 may be integrated on the same die with logic for one or more controller(s) of system control logic 508.
  • at least one of the processor(s) 504 may be integrated on the same die with logic for one or more controller(s) of system control logic 508 to form a System on Chip (SoC).
  • SoC System on Chip
  • the system 500 may further include input/output (I/O) devices 532.
  • I/O devices 532 may include user interfaces designed to enable user interaction with the system 500, peripheral component interfaces designed to enable peripheral component interaction with the system 500, and/or sensors designed to determine environmental conditions and/or location information related to the system 500.
  • the user interfaces could include, but are not limited to, a display (e.g., a liquid crystal display, a touch screen display, etc.), a speaker, a microphone, one or more cameras (e.g., a still camera and/or a video camera), a flashlight (e.g., a light emitting diode flash), and a keyboard.
  • a display e.g., a liquid crystal display, a touch screen display, etc.
  • a speaker e.g., a microphone
  • one or more cameras e.g., a still camera and/or a video camera
  • a flashlight e.g., a light emitting diode flash
  • the peripheral component interfaces may include, but are not limited to, a non-volatile memory port, an audio jack, and a power supply interface.
  • the sensors may include, but are not limited to, a gyro sensor, an accelerometer, a proximity sensor, an ambient light sensor, and a positioning unit.
  • the positioning unit may also be part of, or interact with, the network interface 520 to communicate with components of a positioning network, e.g., a global positioning system (GPS) satellite.
  • GPS global positioning system
  • system 500 may be a mobile computing device such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, a smartphone, etc. In various embodiments, system 500 may have more or less components, and/or different architectures.
  • Various embodiments include an apparatus that comprises: one or more computer-readable storage media configured to store a plurality of instructions; and one or more processors coupled to the one or more computer-readable storage media, the one or more processors, in response to executing the plurality of instructions, being configured to: receive CSI-RS resource configuration information; determine a plurality of CSI-RS indices based on the CSI-RS configuration information; and identify a plurality of points of an uplink CoMP cooperating set based on the plurality of CSI-RS indices.
  • the one or more processors and one or more computer-readable media may be configured as control-plane circuitry of the apparatus, wherein the CSI-RS resource configuration information is received by RRC circuitry of the control-plane circuitry as part of a CoMP initialization process.
  • the CSI-RS resource configuration information may include transmission parameters associated with CSI-RS, wherein the transmission parameters include transmit power, periodicity, subframe offset, initialization seeds, and/or number of utilized antenna ports.
  • the plurality of CSI-RS indices may be included in the CSI-RS configuration information or the one or more processors are configured to determine the plurality of CSI-RS indices based on an order of CSI-RSs included in the CSI-RS resource configuration information.
  • the one or more processors may be configured to: receive a message; determine, based on the message, a CoMP RP set that includes a subset of the points of the CoMP cooperating set that are to receive an uplink data transmission from the apparatus; and determine, based on the message, uplink power control parameters.
  • the one or more processors may be configured to: receive a plurality of uplink power control parameter sets that respectively correspond to a plurality of CoMP RP sets; and determine the uplink power control parameters, which may be included in the message, based on the uplink power control parameter set that corresponds to the CoMP RP set.
  • the uplink power control parameters may include a target signal to noise ratio and ⁇ , wherein ⁇ is a fractional power control parameter.
  • the one or more processors may be further configured to determine pathloss information based on a message fed back from one or more points of the CoMP cooperating set.
  • the one or more processors may be further configured to determine the pathloss information based on an average received power of the CSI-RS information, as measured by the apparatus.
  • the one or more processors may be further configured to semi-statically determine the respective CSI-RS index of a preferred one of the plurality of points of the uplink CoMP cooperating set received via an RRC message, wherein the preferred one of the plurality of points is configured to actively receive data from the apparatus.
  • the one or more processors may be further configured to derive a plurality of base sequences, group hopping patterns, and/or sequence hopping patterns from one or more virtual cell identifications.
  • the one or more processors may be further configured to: receive a list of uplink power control parameter sets that respectively correspond to receive point sets; determine a reception point set, which is a subset of the uplink CoMP cooperating set; determine an uplink power control parameter set that corresponds to the reception point set; and control transmission of uplink signals to the reception point set based on the uplink power control parameter set.
  • an eNodeB that includes: one or more computer-readable media configured to store a plurality of instructions; and one or more processors coupled to the one or more computer-readable media and, in response to executing the plurality of instructions, configured to support user equipment (UE)-specific configuration of uplink demodulation reference signals (DM-RS) and configured to: configure a plurality of base sequences at a cell-level; determine communication schedules of one or more UEs; and dynamically assign respective base sequences from the plurality of base sequences to the one or more UEs based on the determined communication schedules.
  • UE user equipment
  • DM-RS uplink demodulation reference signals
  • the plurality of base sequences may be associated with a CoMP CRM set.
  • the uplink DM-RS may include parameters that enable each of the one or more UEs to select one of the plurality of base sequences, CS hopping pattern, group hopping pattern, sequence hopping pattern, a cyclic shift, and an OCC to determine respective DM-RS sequences associated with respective ones of the one or more UEs.
  • the one or more processors may be configured to: semi-statically signal to the UE a plurality of virtual cell identifications, each corresponding to one of the plurality of base sequences, via radio resource control (RRC) level broadcast signaling or RRC level dedicated signaling; or semi-statically signal to the UE a single virtual cell identification corresponding to one of the plurality base sequences via RRC level broadcast signaling or RRC level dedicated signaling.
  • RRC radio resource control
  • the one or more processors may be further configured to: signal dynamic selection of one of a plurality of virtual cell identifications through a MAC-CE, wherein the one of the plurality of virtual cell identifications enables derivation of one of the plurality of base sequences, if the plurality of virtual cell identifications are semi-statically signaled to the UE via broadcast or dedicated RRC signaling; combine dynamic selection of one of the plurality of virtual cell identifications with MAC-CE messaging used to set uplink power control parameters, if the plurality of virtual cell identifications are semi-statically signaled to the UE via broadcast or dedicated RRC signaling; or signal dynamic selection of one of the plurality of virtual cell identifications, in DCI carried by a PDCCH, with indices assigned to one of the plurality of virtual cell identifications, if the plurality of virtual cell identifications are semi-statically signaled to the UE via broadcast or dedicated RRC signaling.
  • the one or more processors may be further configured to signal one of 8 or more cyclic shift values associated with the uplink DM-RS. In some embodiments, the one or more processors may be configured to signal one of 8 or more cyclic shift values to increase capacity of SRS in uplink CoMP operation.
  • the one or more processors may be configured to semi-statically signal a preferred one of a plurality of reception points indicated by a corresponding one of a plurality of CSI-RS indices to obtain pathloss information that is usable by the one or more UEs for open loop power control for SRS transmissions.
  • the one or more processors may be configured to adjust power control parameters of SRS transmissions based on an uplink CoMP cooperating set with signals to a plurality of CSI-RS resource indices that correspond to the uplink CoMP cooperating set.
  • Some embodiments disclose one or more computer readable media having instructions which, when executed by a processor of a user equipment (UE), enable the UE to: receive, through radio resource control (RRC) signaling, a plurality of sets of sounding reference signal (SRS) parameters of a cell to which the UE is connected; and receive, through RRC-level signaling or media access control (MAC)-level signaling, an indication of a set of SRS parameters, selected from the plurality of sets, to be used for SRS transmission.
  • RRC radio resource control
  • SRS sounding reference signal
  • MAC media access control
  • the plurality of sets may be broadcast or unicast by the cell.
  • the instructions may further enable the UE to: adjust power control parameters of SRS transmissions based on an uplink cooperating multipoint (CoMP) cooperating set with signals to the plurality of CSI-RS resource indices that correspond to the uplink CoMP cooperating set.
  • CoMP uplink cooperating multipoint
  • Some embodiments describe one or more computer-readable media having instructions which, when executed by a processor of an eNodeB, enable the eNodeB to support coordinated multipoint (CoMP) operations and enable the eNodeB to: determine UE-specific acknowledge (ACK) and negative-acknowledge (NACK) resource offsets N (1) PUCCH for dynamic resource allocation of physical uplink control channel (PUCCH) carrying dynamic ACK/NACK; and transmit the ACK/NACK resource offset N (1) PUCCH to a respective UE.
  • CoMP coordinated multipoint
  • ACK UE-specific acknowledge
  • NACK negative-acknowledge
  • the instructions may enable the eNodeB to determine the UE-specific ACK/NACK resource offset N (1) PUCCH for PUCCH formats 1a and 1b.
  • the PUCCH formats 1a and 1b may use a physical cell ID.
  • the instructions may enable the eNodeB to transmit a different virtual cell ID index for each PUCCH format used by a UE.
  • Some embodiments disclose an apparatus comprising: means to receive CSI-RS resource configuration information; means to determine a plurality of CSI-RS indices based on the CSI-RS configuration information; and means to identify a plurality of points of an uplink CoMP cooperating set based on the plurality of CSI-RS indices.
  • the CSI-RS resource configuration information may be received by RRC circuitry of the apparatus as part of a CoMP initialization process.
  • the CSI-RS resource configuration information may include transmission parameters associated with CSI-RS, wherein the transmission parameters include transmit power, periodicity, subframe offset, initialization seeds, and/or number of utilized antenna ports.
  • the apparatus may further include: means to receive a message; means to determine, based on the message, a CoMP reception point (RP) set that includes a subset of the points of the CoMP cooperating set that are to receive an uplink data transmission from the apparatus; means to determine, based on the message, uplink power control parameters; means to receive a plurality of uplink power control parameter sets that respectively correspond to a plurality of CoMP RP sets; and means to determine the uplink power control parameters based on the uplink power control parameter set that corresponds to the CoMP RP set.
  • RP CoMP reception point
  • Some embodiments disclose an eNodeB, comprising circuitry to: support UE-specific configuration of uplink DM-RS; configure a plurality of base sequences at a cell-level; determine communication schedules of one or more UEs; and dynamically assign respective base sequences from the plurality of base sequences to the one or more UEs based on the determined communication schedules.
  • the plurality of base sequences may be associated with a particular CRM set.
  • the eNodeB circuitry may semi-statically signal to the UE a plurality of virtual cell identifications, each corresponding to one of the plurality of base sequences, via radio resource control (RRC) level broadcast signaling or RRC level dedicated signaling; or semi-statically signal to the UE a single virtual cell identification corresponding to one of the plurality base sequences via RRC level broadcast signaling or RRC level dedicated signaling.
  • RRC radio resource control
  • the eNodeB circuitry may signal dynamic selection of one of a plurality of virtual cell identifications through a media access control-control element (MAC-CE), wherein the one of the plurality of virtual cell identifications enables derivation of one of the plurality of base sequences, if the plurality of virtual cell identifications are semi-statically signaled to the UE via broadcast or dedicated RRC signaling; combine dynamic selection of one of the plurality of virtual cell identifications with MAC-CE messaging used to set uplink power control parameters, if the plurality of virtual cell identifications are semi-statically signaled to the UE via broadcast or dedicated RRC signaling; or signal dynamic selection of one of the plurality of virtual cell identifications, in downlink control information (DCI) carried by a physical downlink control channel (PDCCH), with indices assigned to one of the plurality of virtual cell identifications, if the plurality of virtual cell identifications are semi-statically signaled to the UE via broadcast or dedicated RRC signaling.
  • DCI downlink control information

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Claims (15)

  1. Benutzergerät, UE, (104), umfassend:
    erste Schaltung, um eine Bitübertragungsschicht-Zellenkennung zu bestimmen, die einer Zelle eines Evolved Universal Mobile Telecommunication System Terrestrial Radio Access Network, E- UTRAN, entspricht;
    zweite Schaltung zum Empfangen von:
    Funkressourcensteuerungs-Signalisierung, die halbstatisch eine Liste von virtuellen Zellenkennungen konfiguriert,
    Downlink-Steuerungsinformation von einem Physical Downlink Control Channel, wobei die Downlink-Steuerungsinformation einen Index trägt, der dynamisch eine der virtuellen Zellenkennungen der Liste auswählt; und
    dritte Schaltung zum:
    Erzeugen eines Demodulations-Referenzsignal-, DM-RS, Parameters basierend auf der ausgewählten virtuellen Zellenkennung, wobei der DM-RS-Parameter ein Seed ist, wobei der Seed verwendet wird zum Ableiten einer BasisSequenz für ein DM-RS in einer Weise gemäß 3GPP LTE Release 10;
    Bestimmen einer zyklischen Verschiebung für das DM-RS, wobei die zyklische Verschiebung bestimmt wird, indem ein zyklischer Verschiebungsparameter verwendet wird, der unabhängig von der ausgewählten virtuellen Zellenkennung an die UE signalisiert wird.
  2. UE (104) nach Anspruch 1, wobei der DM-RS-Parameter einem Gruppen-Hopping-Muster entspricht.
  3. UE (104) nach Anspruch 1, wobei der DM-RS-Parameter mit einem Physical Uplink Shared Channel verknüpft ist.
  4. UE (104) nach Anspruch 1, wobei der DM-RS-Parameter ein Sequenz-Hopping-Parameter ist.
  5. UE (104) nach Anspruch 1, wobei der zyklische Verschiebungsparameter einen Slot-by-Slot-Hopping-Mechanismus zwischen zyklischen Verschiebungen definiert, die von dem UE verwendet werden.
  6. UE (104) nach Anspruch 1, wobei der DM-RS-Parameter ein zweiter zyklischer Verschiebungsparameter für das DM-RS für einen Physical Uplink Shared Channel ist.
  7. UE (104) nach Anspruch 1, ferner umfassend:
    vierte Schaltung zum Kommunizieren mit einem Positionierungsnetzwerk.
  8. Basisstation (108a), umfassend:
    erste Schaltung zum Bereitstellen einer Zellenkennung der Bitübertragungsschicht für ein Benutzergerät (UE), die einer Zelle eines Evolved Universal Mobile Telecommunication System Terrestrial Radio Access Network, E-UTRAN, entspricht;
    zweite Schaltung zum Auswählen:
    einer virtuellen Zellenkennung aus einer Liste von virtuellen Zellenkennungen; und
    dritte Schaltung zum Bereitstellen für die UE von:
    Funkressourcen-Steuerungs-Signalisierung, die die Liste der virtuellen Zellenkennungen halbstatisch konfiguriert,
    Downlink-Steuerungsinformation in einem Physical Downlink Control Channel, wobei die Downlink-Steuerungsinformation einen Index trägt, der dynamisch Auswahl der ausgewählten virtuellen Zellenkennung zur Verwendung beim Erzeugen eines Demodulations-Referenzsignal-, DM-RS-, Parameters anzeigt, wobei der DM-RS-Parameter ein Seed ist und wobei der Seed verwendet wird zum Ableiten einer Basissequenz für ein DM-RS in einer Weise gemäß 3GPP LTE Release 10,
    einem zyklischen Verschiebungsparameter zur Verwendung beim Bestimmen einer zyklischen Verschiebung für das DM-RS, wobei der zyklische Verschiebungsparameter unabhängig von der ausgewählten virtuellen Zellenkennung an die UE signalisiert wird.
  9. Basisstation (108a) nach Anspruch 8, wobei die ausgewählte virtuelle Zellenkennung zur Verwendung beim Erzeugen eines Sounding-Referenzsignal-Parameters dient.
  10. Basisstation (108a) nach Anspruch 8, wobei der DM-RS-Parameter einem Gruppen-Hopping-Muster entspricht.
  11. Basisstation (108a) nach Anspruch 8, wobei der zyklische Verschiebungsparameter einen Slot-by-Slot-Hopping-Mechanismus zwischen zyklischen Verschiebungen definiert, die von dem UE verwendet werden sollen.
  12. Basisstation (108a) nach Anspruch 8, wobei die Basisstation ein eNB ist.
  13. Basisstation (108a) nach Anspruch 8, wobei der Demodulations-Referenzsignal-Parameter mit einem Physical Uplink Shared Channel verknüpft ist.
  14. Basisstation (108a) nach Anspruch 8, wobei der DM-RS-Parameter ein Sequenz-Hopping-Parameter ist.
  15. Basisstation (108a) nach Anspruch 8, wobei der DM-RS-Parameter ein zweiter zyklischer Verschiebungsparameter für den DM-RS für einen Physical Uplink Shared Channel ist.
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US201261591641P 2012-01-27 2012-01-27
US13/536,722 US8917618B2 (en) 2012-01-27 2012-06-28 Uplink coordinated multi-point
PCT/US2013/022935 WO2013112711A1 (en) 2012-01-27 2013-01-24 Uplink coordinated multi-point

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